@random255: `Math.ceil(Math.random()*255)`;
.setup {
    position: absolute;
    top: 50%;
    left: 50%;
    margin-left: -50px;
    margin-top: -6px;
    font-size: 14px;
    color: white;
    background-color: rgba(179, 179, 179, 0.7);
    border-radius: 25px;
    display: none;
    cursor: pointer;
}

.setup:hover {
    background-color: rgba(179, 179, 179, 0.2);
}

.container {
    position: relative;
    width: 100%;
    height: 170px;
    text-align: center;
}

.container:hover .setup {
    display: inline;
}

.loadding {
    width: 100%;
    height: 100%;
    background-color: rgb(@random255, @random255, @random255);
}